You are certainly having a very bad time with your son who is living proof of the 'terrible twos' There is definitely a problem here. Your son may be showing a form of attention seeking behaviour. Do not smack him as this may result in him becoming even more aggressive and this may persist to later in his life.He does not realise the consequences of his behaviour at his age.Try to raise his self esteem by praising him for anything that he does well or if he behaves well.
I know that you have already seen a paediatrician and a psychologist but would like you to take your son to see a paediatric neurologist. There are some forms of epilepsy where children present with extremely aggressive behavior.He is to young to diagnose ADD but this needs to be considered as well as some forms of the autism syndrome.
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